include/linux/msm_remote_spinlock.h

/* Copyright (c) 2009, 2011, 2013-2015 The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

/*
 * Part of this this code is based on the standard ARM spinlock
 * implementation (asm/spinlock.h) found in the 2.6.29 kernel.
 */

#ifndef __ASM__ARCH_QC_REMOTE_SPINLOCK_H
#define __ASM__ARCH_QC_REMOTE_SPINLOCK_H

#include <linux/io.h>
#include <linux/types.h>

#define REMOTE_SPINLOCK_NUM_PID 128
#define REMOTE_SPINLOCK_TID_START REMOTE_SPINLOCK_NUM_PID

/* Remote spinlock definitions. */

typedef struct {
	volatile uint32_t lock;
} raw_remote_spinlock_t;

typedef raw_remote_spinlock_t *_remote_spinlock_t;

#define remote_spinlock_id_t const char *

#if defined(CONFIG_REMOTE_SPINLOCK_MSM)
int _remote_spin_lock_init(remote_spinlock_id_t, _remote_spinlock_t *lock);
void _remote_spin_release_all(uint32_t pid);
void _remote_spin_lock(_remote_spinlock_t *lock);
void _remote_spin_unlock(_remote_spinlock_t *lock);
int _remote_spin_trylock(_remote_spinlock_t *lock);
int _remote_spin_release(_remote_spinlock_t *lock, uint32_t pid);
int _remote_spin_owner(_remote_spinlock_t *lock);
void _remote_spin_lock_rlock_id(_remote_spinlock_t *lock, uint32_t tid);
void _remote_spin_unlock_rlock(_remote_spinlock_t *lock);
int _remote_spin_get_hw_spinlocks_element(_remote_spinlock_t *lock);
#else
static inline
int _remote_spin_lock_init(remote_spinlock_id_t id, _remote_spinlock_t *lock)
{
	return -EINVAL;
}
static inline void _remote_spin_release_all(uint32_t pid) {}
static inline void _remote_spin_lock(_remote_spinlock_t *lock) {}
static inline void _remote_spin_unlock(_remote_spinlock_t *lock) {}
static inline int _remote_spin_trylock(_remote_spinlock_t *lock)
{
	return -ENODEV;
}
static inline int _remote_spin_release(_remote_spinlock_t *lock, uint32_t pid)
{
	return -ENODEV;
}
static inline int _remote_spin_owner(_remote_spinlock_t *lock)
{
	return -ENODEV;
}
static inline void _remote_spin_lock_rlock_id(_remote_spinlock_t *lock,
					      uint32_t tid) {}
static inline void _remote_spin_unlock_rlock(_remote_spinlock_t *lock) {}
static inline int _remote_spin_get_hw_spinlocks_element(
		_remote_spinlock_t *lock)
{
	return -ENODEV;
}
#endif
#endif /* __ASM__ARCH_QC_REMOTE_SPINLOCK_H */